A tip to law enforcement about 48 hours after the killing helped investigators focus on Cook, according to the affidavit. That information reportedly came from someone who only knew Cook by the nickname "Doc" but said Cook had told him that he shot at Baker multiple times. Investigators were then able to use the nickname to develop Cook as the suspect.

According to the affidavit, a man who was walking with Baker at the time of the shooting told investigators that they were walking to a friend's house when they cut through the parking lot of a Walgreens store at the intersection of Covert and Weinbach avenues and encountered the suspected shooter, who had just left a nearby Chuckles gas station.

The man told police Cook started following him and Baker before demanding that they get on the ground when they got to Cass Avenue. The witness said he told Baker to run and that is when he heard three or four shots. He called 911, but Baker was pronounced dead at the scene.

An autopsy concluded that Baker died after being struck by a bullet in the back.

The person walking with Baker also identified Cook as the shooter after being shown a photograph of him, investigators said. Police noted that surveillance footage from Walgreen's shows a man in a hooded sweatshirt following Baker and the other person about four minutes before the shooting was reported.

Police arrested Cook after serving a search warrant at an address in the 1900 block of Colts Lane. One of the people inside the residence reportedly told police that Cook had been staying there for about a week, according to the affidavit. That person also said Cook told her that he got rid of a handgun on June 6 that investigators said matched the description of the weapon used in the shooting.

During a post-arrest interview with investigators, Cook reportedly denied shooting Baker. However, he did acknowledge that he was in the area and followed Baker and the person that she was with before the shooting happened, according to the affidavit.

In his police interview, Cook claimed he was with another person who was trying to rob the pair when the shooting happened. However, according to the affidavit Cook's account of the incident allegedly changed multiple times as he was confronted with discrepancies by investigators.